By David Spunt

PHILADELPHIA (CBS)–Hundreds of remains discovered at an Old City construction site earlier this year are now undergoing analysis.

One by one, 300-year-old wooden coffins from Philadelphia were unloaded off a truck Thursday afternoon.

READ MORE: Disaster Recovery Centers Open In Montgomery, Chester Counties To Assist Applying For Federal Aid In Wake Of Ida

“It’s so rare that we get an opportunity to really see a cross section of society at a particular point in time,” forensic archaeologist Kimberlee Moran told Eyewitness News.

More Than 100 Bodies, 70 Coffins Recovered From Construction Site In Old City

Moran is talking about the years 1707 to 1859. Hundreds of people were supposed to be moved by 1859 to a church in Southwest  Philadelphia. It never happened.

In March crews discovered hundreds of remains at a construction site at 218 Arch Street.

READ MORE: New Jersey To Help Resettle About 500 Afghan Evacuees, Gov. Murphy Says

“Why were they left behind and who were they?” Moran asked.

Exclusive: Tour Of Forensics Lab Housing 1700s Remains Found At Construction Site

George Leader is an archaeologist with The College of New Jersey and he’s helping Moran and the team.

“We immediately noticed that this project was going to be massive,” he said.

For more information on the project or if you would like to make a donation visit: www.archstbones.org

MORE NEWS: 'I Got To Lead By Example': Eagles' Nick Sirianni Does Some Self-Evaluating After 17-11 Loss To 49ers